Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a faixa de renda do chefe de família enquanto solteiro é $171,551–$372,950?
 ###Tabelas: CREATE TABLE railway_stations_currently_in_use (railway_stations_currently_in_use_id AUTO_INCREMENT PRIMARY KEY, Station (and code) VARCHAR, Managed by VARCHAR, Lines served VARCHAR, Station users 2007/8 INT, Station users 2008/9 VARCHAR, Year opened VARCHAR, Platforms VARCHAR, Borough VARCHAR) CREATE TABLE regular_and_capital_gains_tax_rates_for_2009 (regular_and_capital_gains_tax_rates_for_2009_id AUTO_INCREMENT PRIMARY KEY, Marginal Ordinary Income Tax Rate VARCHAR, Single VARCHAR, Married Filing Jointly or Qualified Widow(er) VARCHAR, Married Filing Separately VARCHAR, Head of Household VARCHAR) CREATE TABLE season_by_season (season_by_season_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Passenger VARCHAR, Equipment VARCHAR, Position VARCHAR, Points INT, Races INT, Wins VARCHAR, Second VARCHAR, Third VARCHAR) CREATE TABLE chronology_of_worldwide_membership (chronology_of_worldwide_membership_id AUTO_INCREMENT PRIMARY KEY, Year INT, Worldwide INT, Africa INT, America INT, Asia INT, Australia INT, Europe INT) CREATE TABLE england_career (england_career_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Venue VARCHAR, Opposition VARCHAR, Att. INT, Result VARCHAR, Goals INT)  
SELECT Head of Household FROM regular_and_capital_gains_tax_rates_for_2009 WHERE Single = $171,551–$372,950